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You searched for: creator:"P. K. S"
[texts]What to do with the cold mutton : a book of réchauffés. Together with many other approved receipts for the kitchen of a gentleman of moderate income - S., P. K
Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.
Keywords: Cookery, American; cbk
Downloads: 217
[texts]What to do with the cold mutton : a book of réchauffés. Together with many other approved receipts for the kitchen of a gentleman of moderate income - S., P. K
Preface signed: P. K. S
Keywords: Cookery, American; cbk
Downloads: 328
[texts]Some remarks on the dynamical systems approach to fourth order gravity - S. Carloni
Building on earlier work, we discuss a general framework for exploring the cosmological dynamics of Higher Order Theories of Gravity. We show that once the theory of gravity has been specified, the cosmological equations can be written as a first-order autonomous system and we give several examples which illustrate the utility of our method. We also discuss a number of results which have appeared recently in the literature.
Downloads: 1
[texts]Constraining scalar-tensor quintessence by cosmic clocks - S. Capozziello
Scalar-tensor quintessence models can be constrained by identifying suitable cosmic clocks which allow to select confidence regions for cosmological parameters. In particular, we constrain the characterizing parameters of non-minimally coupled scalar-tensor cosmological models which admit exact solutions of the Einstein field equations. Lookback time to galaxy clusters at low intermediate, and high redshifts is considered...
Downloads: 2
[texts]Cosmological dynamics of fourth order gravity - S Carloni
We discuss the dynamical system approach applied to Higher Order Theories of Gravity. We show that once the theory of gravity has been specified, the cosmological equations can be written as a first-order autonomous system and we give several examples which illustrate the utility of our method. We also discuss a number of results which have appeared recently in the literature.
Downloads: 8
[texts]Cosmological dynamics of R^n gravity - S. Carloni
A detailed analysis of dynamics of cosmological models based on $R^{n}$ gravity is presented. We show that the cosmological equations can be written as a first order autonomous system and analyzed using the standard techniques of dynamical system theory. In absence of perfect fluid matter, we find exact solutions whose behavior and stability are analyzed in terms of the values of the parameter $n$...
Downloads: 1
[texts]The evolution of cosmological gravitational waves in f(R) gravity - Kishore N. Ananda
We give a rigorous and mathematically clear presentation of the Covariant and Gauge Invariant theory of gravitational waves in a perturbed Friedmann-Lemaitre-Robertson-Walker universe for Fourth Order Gravity, where the matter is described by a perfect fluid with a barotropic equation of state. As an example of a consistent analysis of tensor perturbations in Fourth Order Gravity, we apply the formalism to a simple background solution of R^n gravity...
Downloads: 2
[texts]Cosmological dynamics of exponential gravity - M. Abdelwahab
We present a detailed investigation of the cosmological dynamics based on $\exp (-R/{\Lambda})$ gravity. We apply the dynamical system approach to both the vacuum and matter cases and obtain exact solutions and their stability in the finite and asymptotic regimes. The results show that cosmic histories exist which admit a double de-Sitter phase which could be useful for describing the early and the late-time accelerating universe.
Downloads: 2
[texts]Response to ``Comment on `Primordial magnetic seed field amplification by gravitational waves' " - G. Betschart
Here we respond to the comment by Tsagas (gr-qc/0503042) on our paper gr-qc/0503006. We show that the results in that comment are flawed and cannot be used for drawing conclusion about the nature of magnetic field amplification by gravitational waves, and give further support that the results of gr-qc/0503006 are correct.
Downloads: 3
[texts]Newtonian Evolution of the Weyl Tensor - G. F. R. Ellis
In an interesting recent paper on the growth of inhomogeneity through the effect of gravity [1], Bertschinger and Hamilton derive equations for the electric and magnetic parts of the Weyl tensor for cold dust for both General Relativity and Newtonian theory. Their conclusion is that both in General Relativity and in Newtonian theory, in general the magnetic part of the Weyl tensor does not vanish, implying that the Lagrangian evolution of the fluid is not local...
Downloads: 7
[texts]The evolution of density perturbations in f(R) gravity - S. Carloni
We give a rigorous and mathematically well defined presentation of the Covariant and Gauge Invariant theory of scalar perturbations of a Friedmann-Lemaitre-Robertson-Walker universe for Fourth Order Gravity, where the matter is described by a perfect fluid with a barotropic equation of state. The general perturbations equations are applied to a simple background solution of R^n gravity. We obtain exact solutions of the perturbations equations for scales much bigger than the Hubble radius...
Downloads: 2
[texts]Shrinking and the True Power Spectrum at Decoupling - B. A. C. C. Bassett
In this paper we examine the change in the estimated spatial power spectra at decoupling due to the effects of our clumpy universe which modify observational distances. We find that scales at decoupling can be significantly underestmated in our approximation of neglecting the shear of the ray bundle. We compare our results with other work on lensing and speculate on the implications for structure formation...
[texts]Cosmological dynamics of Scalar--Tensor Gravity - S Carloni
We study the phase--space of FLRW models derived from Scalar--Tensor Gravity where the non--minimal coupling is $F(\phi)=\xi\phi^2$ and the effective potential is $V(\phi)=\lambda \phi^n$. Our analysis allows to unfold many feature of the cosmology of this class of theories. For example, the evolution mechanism towards states indistinguishable from GR is recovered and proved to depend critically on the form of the potential $V(\phi)$...
Downloads: 1
[texts]A Solution to the Graceful Exit Problem in Pre-Big Bang Cosmology - G. F. R. Ellis
We examine the string cosmology equations with a dilaton potential in the context of the Pre-Big Bang Scenario with the desired scale factor duality, and give a generic algorithm for obtaining solutions with appropriate evolutionary properties. This enables us to find pre-big bang type solutions with suitable dilaton behaviour that are regular at $t=0$, thereby solving the graceful exit problem. However to avoid fine tuning of initial data, an `exotic' equation of state is needed that relates th...
Downloads: 1
[texts]Integrability Conditions for Irrotational Dust with a Purely Electric Weyl Tensor: A Tetrad Analysis - W. M. Lesame
All spacetimes for an irrotational collisionless fluid with a purely electric Weyl tensor, with spacetime curvature determined by the exact Einstein field equations, are shown to be integrable. These solutions include the relativistic generalisations of the Zeldovich solutions of Newtonian theory. Thus our result shows the consistency of various studies of "silent" universes (where such consistency was assumed rather than proved).
Downloads: 7
[texts]Irrotational dust with Div H=0 - W. M. Lesame
For irrotational dust the shear tensor is consistently diagonalizable with its covariant time derivative: $\sigma_{ab}=0=\dot{\sigma}_{ab},\; a\neq b$, if and only if the divergence of the magnetic part of the Weyl tensor vanishes: $div~H = 0$. We show here that in that case, the consistency of the Ricci constraints requires that the magnetic part of the Weyl tensor itself vanishes: $H_{ab}=0$.
Downloads: 10
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